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By default, Ubuntu will not configure Nagios upon installation. This guide will show how to install Nagios on an Ubuntu system running a common LAMP setup with ISPConfig 3

Install Nagios 3, Plugins, MySQL Support¶

sudo apt-get install nagios3 nagios-plugins nagios-nrpe-plugin ndoutils-nagios3-mysql

• Set password for nagiosadmin user
• Confirm password
• Enter MySQL root password
• Create Nagios database password

Setup host in ISPConfig¶

• Navigate to the [Site] tab

Create a new site¶

• Domain: monitor.example.com
• Disable: CGI
• Disable: SuExec
• Enable: SSL

• Append to the following to the PHP basedir:
  

  :/usr/lib/cgi-bin/nagios3:/usr/share/nagios3/htdocs:/etc/nagios3/stylesheets
  

• Add the following Apache directive (Taken from the /etc/nagios3/apache2.conf):
  

  # apache configuration for nagios 3.x
  
  ScriptAlias /cgi-bin/nagios3 /usr/lib/cgi-bin/nagios3
  
  # Where the stylesheets (config files) reside
  Alias /stylesheets /etc/nagios3/stylesheets
  
  # Where the HTML pages live
  # Changed "Alias" directive to "DocumentRoot" as Nagios 3 is installed via apt and is located outside the default web directory.
  DocumentRoot /usr/share/nagios3/htdocs
  
  <DirectoryMatch (/usr/share/nagios3/htdocs|/usr/lib/cgi-bin/nagios3|/etc/nagios3/stylesheets)>
      Options FollowSymLinks
  
      DirectoryIndex index.php index.html
  
      AllowOverride AuthConfig
      Order Allow,Deny
      Allow From All
  
      AuthName "Nagios Access" 
      AuthType Basic
      AuthUserFile /etc/nagios3/htpasswd.users
      require valid-user
  </DirectoryMatch>
  
  <Directory /usr/share/nagios3/htdocs>
      Options    +ExecCGI    
  </Directory>
  

At this point Nagios should work by going to monitor.example.com/.